Mechanical movement.



A. H. DE VOE. MECHANICAL MOVEMENT. APPLICATION FILED APR.G, 1911.

1,289,126, Patented m. 31, 1918.

2 SHEET$$HEET ATTORNEY A. H. DE VOE.

MECHANICAL IVIOVEMEIJT.v APPLICATION FILED APR.6. 1911.

- Patented Dec. 31, 1918. 1,289,126, 2 5HEETS-SHEET 2.

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ALBERT H. DE VOE, OF WESTFIELD, NEW JERSEY, ASSIGNQR TO THE SINGER MANU- FACTURING COMPANY, A CORPORATION OF NEW JERSEY.

MECHANICAL MOVEMENT.

To all whom it may concern:

Be it known that I, ALBERT H. DE Von, a citizen of the United States, residing at Westfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Mechanical Movements, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to a mechanical movement particularly adaptable for actuating a take-up for looper-threads on sewing machines. 1 I

The invention aims to provide mechanism between a rotary driving shaft and an oscillatory driven shaft having a thread-arm or other stitch-forming element fixed thereto for imparting oscillations to the driven shaft each interrupted by a dwell that may be timed to occur before, at or after the driven shaft changes its direction of motion at one extremity of its oscillation. I a

The construction broadly comprises a plurality of take-up arms fixed to a shaft having a sliding connection with one end of a lever which is movably fulcrumed interme diate its ends on the arm of a rocker and at its other end embraces an eccentric on a rotary driving shaft parallel with the driven shaft.

The invention also consists in certain de- .tails of construction which will appear in the following description of the accompanying drawings, in which Figure 1 is a perspective view and Fig. 2 a side elevation, partly in section, of an embodiment of my invention as applied to a sewing machine, sufficient of the construction being shown to make clear its application. Fig. 3 is an enlarged view of the take-up and eccentric, the arms and center of the eccentric being numbered the same in the relative positions thev assume during a complete rotation of the mainshaft. Fig. 4 is a diagram of the movement of the take-up arms in different positions of adjustment. Fig. 5 is a graphic diagram showing how the adjustment enables the dwell to be timed before and after the takeup arms reach the end of their stroke.

The invention is shown embodied in a twothread chain-stitch sewing machine having needles 1 cooperating with thread-carrying loopers 2 disposed at an angle to the line of feed and supported on a carrier 3 which is slidingly and pivotally sleeved on a fulcrumshaft 1, an extension 5 of the carrier having a ball-and-socket connection 6 with a strap 7 embracing an inclined crank on the main shaft 9, substantially as in applicants copending case Serial No. 113,022, renewed August 3, 1916.

With each of the loopers 2 a take-up arm 10 is differentially moved to control the thread carried by the looper so as to insure the formation of perfect stitches in a manner fully disclosed in said copending application. I I

This application is directed to protect a mechanism for operating the take-up arms and it will now be described.

The take-up arms 10 are endwise adjust ably secured by screws 11 to a shaft 12 sup ported on bearing blocks 13 and 14. A col lar 15 adjustably secured to the shaft 12 on one side of the block 14 and an offset 16' suitably secured to the shaft at the other side of the block 1 1 restrain endwise movement of the shaft 12 and compel each -of the take-up arms 10 to oscillate in a plane. A pin 17 is secured in the offset 16 substantially at right angles to the shaft 12 and is slidingly connected by a sleeve 18 having a laterally arranged pin 19 with the end of a lever 20. The lever 20 has an apertured boss 21 receiving the pin 19, the end of which pin is tapped for the screw 22 having a relatively large head that is adapted to rest against an end of the apertured boss 21.

At its other end the lever 20 is fashioned into a strap 23 loosely embracing the eccentric 21 fast on the main-shaft 9. Intermediate its ends the lever is fulcrumed as at 25 to an arm 26 on a pin 27 in the bearing bracket 28, which is tongue-and-grooved as at 29 on the block 14 and adjustably connected in place, slots 30 in the bracket 28 through which pass the fasteningscrews 31 tapped into the block being provided for that purpose.

Shifting the bearing bracket 28 in the direction of the arrow Fig. 2 causes the takeup arms t dwell at increasingly later time as graphically illustrated in Fig. 5. The dwells may be timed to occur before or after the arms arrive at their extreme retracted position. .By this adjustment for timing it is possible to suit the take-up for cooperation with loopers in a Wide variety of chainstitch machines.

As applied to a take-41p the construction Specification of Letters Patent. Patentgd Dec. 31, 1918. Application filed April 6, 1917. Serial No. 160,098.

furnishes a: means for moving the take-up arms differentially With respect to the loopers; While the invention has been described and illustrated as applied to a take-up for controlling the thread carried by loopers in which it is especially advantageo'usit" is to be understood the invention is not so limited.

It is believed theinvention broadly consists driving shaft, an eccentric element thereon,

aslever operatively connected to said? rotary driving shaft, a fulcrum-for said lever", sa1d fulcrum-being movable-about a fixed. axis,

- driven shaft, a'sliding connection between said lever and said driven shaft, said driven,

- shaft being adapted: to operate ans-lenient of a sewing-machine.

2. In a mechanical movement, a'rot'ary driving sha-ft,,an osclllatorydriven shaft, an arm adapted to-carry thread, said arm being operatively -connected to said oscillatory drivenshaft, positive. means operated by sa1d-rotarydr1v1ngshaft for imparting reei'proeations to=;saidarm interrupted by dwells, said means including; a shiftingand rocking lever;

3. In a llIQCllEilllOLt-l movement, amain driving shaft, a 'driven rock-shaft,nieans between said shafts for-imparting oscillations to said rock-shaft interrupted by dwells from each cycle of operations ofsaid mains'haft, including: aneccentric on" the mainshaft, ailever' actuated thereby, a movable fulcrum for said lever, and a. sliding connection: between said lever eand 'saifd driven shaft.

4.- In a .mechanical movement, a main Copies of this patent may be obtained for five cents each, by. addressing the driving shaft, a driven rock-shaft, means between said shafts for imparting interrupted oscillations to said rock-shaft from each cycleof operations of said main-shaft,

including. an eccentric element on the main driving shaft, a lever, levermovable about an adjustably fixed axis a fulcrum for said and a sliding connection between one end'of said; lever: and: said driven shaft.

5. In a mechanical movement, a main driving shaft, a driven rock-shaft, means between" sa-idshafts forimparting oscillations to said rock shaft interrupted by dwells from each cycleof operationsof said mainsha-ft, including an eccentric element, a lever,

a movable fulcrum for'said lever and a pin and socketconnection between one end of said: lever and'Said' driven shaft.

' 6. In a mechanical movement, drivingishafaa driven rock-shaft, means between said shafts; for imparting oscillations to: said rock--shaft1 interrupted; by dwells from each cycle of operations of: said'mainshaft,.,including 'anzveccentric element, a lever pivoted at; one. end on said element,-. a1 fulcrunr for said lever, a sliding connection between= the other end" of said: lever driven shaft.

In; a mechanical movement, a rotary driving shaft, a driven shaft, and positive mechanical connectionsrbetween said drlving.

and driven shafts for imparting oscillations to-said driven shaft .-interrupted by; dwells.

8.- In a mechanical, movement, rotary driving, shaft, a driven: shaft, and positive mechanical. connections .betweensaid driving and driven shafts for imparting.oscillations tosaid driven: shaft interrupted by dwells, said connections; including an adjustment for varying the timing of a dwell during;

each of the oscillations. a In testimony whereof, name to this specification- ALBERT H DE V01 3.

Commissioner of, Patents Washington; D. 0."

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and said I have signed my I 

